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arXiv 2407.06017math.AGmath.FAmath.OC
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非负多项式与代数曲线上的矩问题

Nonnegative Polynomials and Moment Problems on Algebraic Curves

Sorbonne Université(索邦大学);CNRS(法国国家科学研究中心);MPI MiS(马普学会数学研究所);Georgia Institute of Technology(佐治亚理工学院);Universität Leipzig(莱比锡大学)

Lorenzo Baldi, Grigoriy Blekherman, Rainer Sinn

AI总结:

本文研究了代数曲线上的非负多项式锥的面结构及其对偶矩锥的Carathéodory数,揭示了拓扑对四次规则复杂性的影响,并应用于截断矩问题。

摘要:

非负多项式锥在实代数几何中具有根本性的重要性,但其面结构仅在极少数情况下被理解。我们开始对非负多项式锥pos在光滑实射影曲线X上的面结构进行系统研究。我们证明其面与X上的 totally real effective divisors 之间存在对偶关系。这使我们能够在X的亏格为一时完全描述面格。我们计算了椭圆正则曲线X的对偶矩锥pos∧的Carathéodory数,该数衡量了支持在X上的测度的四次规则的复杂性。有趣的是,X的实部分的拓扑影响pos∧的Carathéodory数。我们应用这些结果到仿射三次曲线上的截断矩问题中,其中我们推导出关于平坦扩展次数的精确界。

英文摘要:

The cone of nonnegative polynomials is of fundamental importance in real algebraic geometry, but its facial structure is understood in very few cases. We initiate a systematic study of the facial structure of the cone of nonnegative polynomials $\pos$ on a smooth real projective curve $X$. We show that there is a duality between its faces and totally real effective divisors on $X$. This allows us to fully describe the face lattice in case $X$ has genus one. We compute the Carathéodory number of the dual moment cone $\pos^\vee$ for an elliptic normal curve $X$, which measures the complexity of quadrature rules of measures supported on $X$. Interestingly, the topology of the real locus of $X$ influences the Carathéodory number of $\pos^\vee$. We apply our results to truncated moment problems on affine cubic curves, where we deduce sharp bounds on the flat extension degree.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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